{"schema":"fak-cache-frontier-review/1","date":"2026-06-29","source_markdown":"reviews/2026-06-29.md","evidence_commands":["go run ./cmd/fak nightrun score --json","go run ./cmd/fak cachevalue report --since 2026-06-22 --json"],"track1_witnessed_kernel":{"verdict":"MEASURED","thin":true,"total_sessions":5,"multi_turn_sessions":1,"single_turn_sessions":4,"total_turns":9,"multi_turn_turns":5,"prompt_tokens":457,"reused_tokens":260,"gate_prompt_tokens":413,"gate_reused_tokens":260,"realized_reuse_ratio":0.6295399515738499,"session_type_mix":{"run":5},"publishable_value_family":"marginal-over-tuned-warm-KV (~1.0x single-session; the vs-naive 1/(1-reuse) re-prefill multiple is excluded per #1066)"},"track2_observed_usd":{"present":false,"ledger":"docs/nightrun/cache-savings.jsonl","reason":"ledger absent or empty; provider-dollar track has no OBSERVED rows yet"},"demo_walkthrough":"../run-the-demos.md#cache-frontier-walkthrough","gaps":["thin_track1_corpus","no_guard_serve_dogfood_rows","no_track2_provider_dollar_rows","multi_agent_geometry_not_recurring_dogfood","o1_query_not_yet_real_session_workflow"],"next_actions":["accumulate more multi-turn cache-value rows","capture multi-turn guard/serve cache-value rows from the dev loop","wire OBSERVED provider-dollar append","record recurring multi-agent dogfood geometry","query a real fak session through the chosen O(1) memory path"],"verdict":"VISIBLE_BUT_NOT_YET_PRODUCT_DOGFOOD"}
{"schema":"fak-cache-frontier-review/1","date":"2026-07-04","source_markdown":"reviews/2026-07-04.md","evidence_commands":["go run ./cmd/fak nightrun score --json","go run ./cmd/fak cachevalue report --since 2026-06-22 --json"],"track1_witnessed_kernel":{"verdict":"MEASURED","thin":true,"total_sessions":11,"multi_turn_sessions":6,"single_turn_sessions":5,"total_turns":71,"multi_turn_turns":66,"prompt_tokens":6051,"reused_tokens":4056,"gate_prompt_tokens":5863,"gate_reused_tokens":4056,"realized_reuse_ratio":0.6965137614678899,"session_type_mix":{"guard":2,"run":9},"publishable_value_family":"marginal-over-tuned-warm-KV (~1.0x single-session; the vs-naive 1/(1-reuse) re-prefill multiple is excluded per #1066)"},"track2_observed_usd":{"present":true,"ledger":"docs/nightrun/cache-savings.jsonl"},"demo_walkthrough":"../run-the-demos.md#cache-frontier-walkthrough","gaps":["thin_track1_corpus","multi_agent_geometry_not_recurring_dogfood","o1_query_not_yet_real_session_workflow"],"next_actions":["accumulate more multi-turn cache-value rows","record recurring multi-agent dogfood geometry","query a real fak session through the chosen O(1) memory path"],"verdict":"VISIBLE_BUT_NOT_YET_PRODUCT_DOGFOOD"}